Summary:
changelog: [internal]
You can read more about this rule on https://clang.llvm.org/extra/clang-tidy/checks/modernize-pass-by-value.html
# Isn't it wasteful to copy? Isn't reference more efficient?
This rule of thumb is no longer true since C++11 with move semantics. Let's look at some examples.
# Option one
```
class TextHolder
{
public:
TextBox(std::string const &text) : text_(text) {}
private:
std::string text_;
};
```
By using reference here, we prevent the caller from using rvalue to and avoiding copy. Regardless of what the caller passes in, copy always happens.
# Option two
```
class TextHolder
{
public:
TextBox(std::string const &text) : text_(text) {}
TextBox(std::string &&text) : text_(std::move(text)) {}
private:
std::string text_;
};
```
Here, we provide two constructors, one for const reference and one for rvalue reference. This gives the caller option to avoid copy. But now we have two constructors, which is not ideal.
# Option three (what we do in this diff)
```
class TextHolder
{
public:
TextBox(std::string text) : text_(std::move(text)) {}
private:
std::string text_;
};
```
Here, the caller has option to avoid copy and we only have single constructor.
Reviewed By: fkgozali, JoshuaGross
Differential Revision: D33276841
fbshipit-source-id: 619d5123d2e28937b22874650366629f24f20a63
Summary:
Renaming the `better` utilities to `butter`:
- to prevent claims that this library is superior to others - it really depends on use cases
- to indicate ease of use throughout the codebase, easily spread like butter
Changelog: [C++][Changed] Renaming C++ better util to butter, used by Fabric internals
Reviewed By: JoshuaGross
Differential Revision: D33242764
fbshipit-source-id: 26dc95d9597c61ce8e66708e44ed545e0fc5cff5
Summary:
Nearly all of these are identical and these compiler_flags are now centralized in rn_defs.bzl. This should have NO CHANGE on build configuration, the flags have just moved for now.
Changelog: [Internal]
Reviewed By: mdvacca
Differential Revision: D31631766
fbshipit-source-id: be40ebeb70ae52b7ded07ca08c4a29f10a0ed925
Summary:
Changelog: [Internal] enable support for C++ 17.
C++ 17 in React Native targets.
Short and comprehensive list of C++ features:
https://github.com/AnthonyCalandra/modern-cpp-features#c17-language-features
Reviewed By: JoshuaGross
Differential Revision: D27431145
fbshipit-source-id: e8da6fe9d70e9b7343a8caec21cdbeb043478575
Summary:
This is a core part of the Timeline feature (aka Time Travel Debugger). With these new primitives, any external library can initiate "saving" all the previous interface changes (commits) and unwind to any previous one (in order to introspect and validate visual side-effects).
The next diff in the stack will implement UI for this feature integrated into Debug menu on iOS.
Changelog: [Internal] Fabric-specific internal change.
Reviewed By: sammy-SC
Differential Revision: D25926660
fbshipit-source-id: 2e5f6892351d3053db8f64c1cf6ff445b0867ad7
Andres Suarez
Samuel Susla
Kevin Gozali
Joshua Gross
CodemodService Bot
Valentin Shergin